Mina's dad has apparently been married multiple times. I remember on one show, they referred to Lenny as being married to Mina's dad's third wife's (don't hold me to the number/sequence of wife/husband) first and fourth husband or something like that - I remember that they had remarried each other. There needs to be a flow chart or something to explain relationships! They all seem to get along pretty well - Karen was at Mina's dad's house visiting with current wife (Missy I think) and the kids out of that relationship when they redid that home.
They did do this video, but it doesn't really explain all the wives/husbands for dad.
http://www.hgtv.com/videos/good-bones-family-tree-0277218