According to Jim: Season 7, Episode 9

7 - 9: Goodwill Hunting

Without consulting with Cheryl, Jim transforms the garage into a cigar lounge and donates the kids' old clothes and furniture to charity. When Cheryl informs Jim that she is pregnant with twins, he is forced to retrieve all the stuff that he gave away, and has to deal with the fact that he is going to be a father of five.