Lois' estranged parents, Ida and Victor, pay the family a visit. Right away, trouble starts brewing. Victor bonds with Reese, Ida gets Malcolm into a fight, and Dewey is haunted by childhood memories of his inattentive grandparents. To make matters worse, Grandpa Victor gives Reese a live grenade as a present, and worse comes to worse, the boob pulls the pin! Luckily the family survived the explosion, but their brand new, expensive refrigerator wasn't as lucky.

It's another Wilkerson family Christmas- Reese, Dewey and Malcolm misbehave a time too many, so Lois moves the tree and all the presents to the garage, which she called, "holding Christmas hostage". While Francis, much to his chagrin, goes to Canada to visit Grandma Ida, whose Christmas spirit was running on empty. Much like her gin bottles.

When Lois' mother visits, she trips on a leaf and decides to sue Hal and Lois...just as Lois finds out she's pregnant again.

As Lois and Hal write their wills in preparation for the baby's birth, they recall various colorful incidents with their four current children.

Hal takes the boys to a bridal show; Lois' mother wants to move in with the family; Malcolm gets an offer to enroll in a prestigious private school.

Lois continues with her strenuous labor, as friends and family all panic around her.

Grandma Ida makes another conjugal visit at the Wilkerson house. This time she isn't alone as she walks in with her beau, Mr. Li a wealthy, widowed Chinese man whom she met at a cruise. Hal and the boys see this as an opportunity to get Ida off their backs once and for all. But Lois thinks that her mother is up to no good as usual. Meanwhile, Malcolm has just got his tongue pierced, but it gets infected right away so he can't say any words that involves an "s" in them. On the day of his grandmother's wedding, he confirms his mother's suspicions when he finds anti-depressant pills in Ida's bag.

Lois has just found out that she has a half-sister named Roberta and brings Reese, Jamie and Malcolm with her to meet their aunt and cousins. Her step-mother, Sylvia comments that she looks exactly like Victor and gives her a warm welcome. Despite some nervous moments between them, they're getting along great. Lois thinks it's going to be nice, quality time with them until a furious and vengeful, Ida arrives at the house to spoil everything. She has lost the court case and demands for Victor's pension from his secret family. Meanwhile Hal and Dewey plan to go racing together, but things don't go as great as they'd expected.

When Grandma Ida visits the family once more, she ends up saving Dewey's life from being run over thus having her leg amputated. Lois forces Francis to take care of his grandma as he's unemployed. Meanwhile Reese and Malcolm decides to go three days without sleeping on the grounds that one of them will be super glued if he fall asleep. Dewey tries to have a leg funeral after feeling bad about what happened to Ida.

Ida forces Lois to bake a special tart for an old-world saint's holiday; Malcolm meets his match with music appreciation; and Hal tries to bond with Reese by watching gory horror movies with him.

In a bid to get to catch the flight to St. Louis for Dewey's piano competition, everything seems to be going wrong for him. Meanwhile, Reese and Malcolm compete with each other to see whether Reese is man enough for the likes of Ida.

Having been denied a very lucrative job in a software company, Malcolm accepts the vision his parents have for him. The first US president that will actually keep in mind the best interests of poor people like his own family.

Grandma Ida makes another conjugal visit at the Wilkerson house. This time she isn't alone as she walks in with her beau, Mr. Li a wealthy, widowed Chinese man whom she met at a cruise. Hal and the boys see this as an opportunity to get Ida off their backs once and for all. But Lois thinks that her mother is up to no good as usual. Meanwhile, Malcolm has just got his tongue pierced, but it gets infected right away so he can't say any words that involves an "s" in them. On the day of his grandmother's wedding, he confirms his mother's suspicions when he finds anti-depressant pills in Ida's bag.

When Grandma Ida visits the family once more, she ends up saving Dewey's life from being run over thus having her leg amputated. Lois forces Francis to take care of his grandma as he's unemployed. Meanwhile Reese and Malcolm decides to go three days without sleeping on the grounds that one of them will be super glued if he fall asleep. Dewey tries to have a leg funeral after feeling bad about what happened to Ida.

Lois' estranged parents, Ida and Victor, pay the family a visit. Right away, trouble starts brewing. Victor bonds with Reese, Ida gets Malcolm into a fight, and Dewey is haunted by childhood memories of his inattentive grandparents. To make matters worse, Grandpa Victor gives Reese a live grenade as a present, and worse comes to worse, the boob pulls the pin! Luckily the family survived the explosion, but their brand new, expensive refrigerator wasn't as lucky.

It's another Wilkerson family Christmas- Reese, Dewey and Malcolm misbehave a time too many, so Lois moves the tree and all the presents to the garage, which she called, "holding Christmas hostage". While Francis, much to his chagrin, goes to Canada to visit Grandma Ida, whose Christmas spirit was running on empty. Much like her gin bottles.

When Lois' mother visits, she trips on a leaf and decides to sue Hal and Lois...just as Lois finds out she's pregnant again.

Ida forces Lois to bake a special tart for an old-world saint's holiday; Malcolm meets his match with music appreciation; and Hal tries to bond with Reese by watching gory horror movies with him.

In a bid to get to catch the flight to St. Louis for Dewey's piano competition, everything seems to be going wrong for him. Meanwhile, Reese and Malcolm compete with each other to see whether Reese is man enough for the likes of Ida.

Hal takes the boys to a bridal show; Lois' mother wants to move in with the family; Malcolm gets an offer to enroll in a prestigious private school.