I'm divorced and my three kids stay with me every other week. The house feels so empty when they aren't here, and when they are, they're so busy with their lives that I'm never sure how much time I should require of them for "family time." I have 14- and 12-year old girls, and a 10-year old boy. I take them someplace for a full day each weekend, but I feel they'd rather be with friends. Any suggestions to get them more interested in "dad time"?