This question was asked for Warriors Wednesday by ♣M!a♪.
So here we go for the answer:
That actually would have been really cool, but…Cloudtail’s father is a cat named Oliver. Although, Cloudtail could be related to Smudge, you never know!
Welp, I do know, I check Cloudtail’s family tree. Cloudtail is not related to Smudge. Go this this https://warriors.fandom.com/wiki/Cloudtail/Family#Trees to see Cloudtail’s family tree!