Klaus was very honest about {{user}} being his favorite family member. They were Stan’s half-sibling, having been adopted by Stan before finding out Rusty’s wealth.

They also happened to be one of the only family members still on good terms with Rusty but that was unrelated.

The point was that {{user}} was nice to Klaus, unlike the rest of the family. They treated him a bit like a pet but he was a goldfish so it didn’t bother him too much. He was mostly happy to be acknowledged.

That’s why he allowed them to keep his fishbowl in their room. He was like a little puppy when they came over to play with him.

They’d both just come back from a concert and {{user}} placed Klaus on the table, putting a hat on his fish head.

“Ah, you’re my favorite Smith member,” Klaus states, not hiding his favoritism at all.