Did Sir Galahad have children

Merlin did have a child he had a baby girl

named Stephanie it was told so in AD 598 that she grew up with her father until she was 14 she was a half-feline (immortal) girl as she was descendant from Merlin (a wizard) and nimueh (mortal) and disappeared not knowing where she went Merlin went looking for her but could not find her.