"You'll see the birth of Tia's baby," Tamera tells TVGuide.com. "You also see Tia go to Atlanta to start The Game and how that affects me because I have this bond already with my nephew and. ... So her leaving for four months is tough. You also see me try to mesh with my husband's style with him moving in. That's been really rough — with his little tchotchkes."
Tia, who gave birth to baby boy Cree in June, says she's been a lot less selfish since becoming a mom "Sometimes when you do things in life, it's all about yourself," she says. "But once you have a child... they motivate you."
Although the sisters have already signed on a second season of the show, they admit there was some hesitation. "Doing a reality show can be exhausting!" Tia says. "The cameras are always there. You're shooting for about 14 hours a day, and then everyone knows what's going on in your lives. When you're walking through an airport it's like they're looking through you. But we had a wonderful response and we do everything for our fans so we're giving back to them."
And for those fans dying for a Sister, Sister reunion? The girls say they already have some ideas about what they'd like to do.
"[It should be] a movie —like a Twins in the City plot ... seeing where they are now," Tamera says. "And where's Roger (Marques Houston)? I think he has all of these women lined up and owns a club."
Watch a clip from Monday's finale airing at 9/8c on Style.