How would he affect the Evans? I know he would eat them out of house and home. What else he would do?

Probably sit around all day and watch TV.

After eating them out of their home and sitting on his butt watching TV alll day, I can see Bookman ordering the Evans' family around and being very bossy and demading, even though the Evans' were kind enough to allow him to stay at their place.

It would have been better for him to move in than that idiot Keith. At least Bookman was funny and his constant putdowns by the Evans family was hilarious.

It would have been better for him to move in than that idiot Keith. At least Bookman was funny and his constant putdowns by the Evans family was hilarious.
Well you can blame Thelma for marrying Keith and the two of them moving back to her original home, but at least (in a way) Keith was a part of the family and did not take advantage of the Evans family the way Bookman did...