Yes, he's married to Evelyn McGee and they have three children.
You don't have to but it's way better to get married and then have children.
Claudette would be his grandmother?
The answer has to be no until some proof is given. There is no mention of such a relation on IMDb for either actor or Wiki page...
Budd and Kelly Bundy and in season seven there is a new addition to the family a boy named 'seven'.