Hammond's biological grandchildren, Kayla and Tessa, whom we see in Chain Reaction. So this implies at least one biological child.

Shifu is Sha're's biological child.

Bill Lee mentions his kids to Sam Carter on a scene on Midway Station, but I cannot recall if that is set in SG-1 or Atlantis.

In Cold Lazarus Sam says that she is an auntie, her brother Mark has two kids, a boy and a girl.

I haven't ever seen any fiction about Hank Landry dealing with his young daughter Carolyn, but it is possible.

It is left deliberately ambiguous as to whether Laira was pregnant when Jack left Edora, with Laira clasping her hands protectively over her womb. It would be ship if the story was about the relationship with Laira, but not if it was purely about the child, or the child's relationship with its father, whether a step-father or a biological one.