If your sister-in-law is still married to your brother and her daughter is the biological child of your brother you would be the child's great aunt or great uncle.
If your sister-in-law is the sister of your husband, her daughter's baby is your great niece or great nephew, and you are the baby's great aunt or great uncle.
If your son's half-sister is not your child, then you are not related to her baby. If she is your child, then her baby is your grandchild.
Technically, your'e not related if they're not married. If they were married, your uncle's girlfriend would be your 'aunt', so her daughter would be your 'first cousin' and her baby would be your 'first cousin, once removed."
second cousin
They are sisters; both daughters of Rhea and Cronus.
They would be great nieces or great nephews.
your second nephew
You call your daughter's baby, your grand-duaghter.
Second cousins once removed.
no
He has three daughters, no sons
Your sister's son is your nephew His sons are your grandnephews, and his daughters are your grandnieces.
Your sister's son is your nephew His sons are your grandnephews, and his daughters are your grandnieces.
second cousin