Amous Diggory

It's not confirmed, but most likely, since the House tu are sorted into tends to be consistent within a family.
Sad picture, btw!

Amos Diggory: link

It's not necessarily true that Sorting follows a family pattern. The Hat was going to sort Harry into Slytherin, and both Lily and James were Gryffindors. Harry chose Gryffindor, just as Sirius Black did. The Hat takes into account things we don't even know about.

Most likely Hufflepuff, but not necessarily. After all, Parvati was in Gryffindor and Padma in Ravenclaw and what's more, they're also twins.

But if I had to take a bet, I'd say Hufflepuff.