DEAR ABBY: My husband of two years was estranged from his children after a nasty divorce. He reconnected with his son “Mack” four years ago and has made every effort to show him he’s a good man and is truly sorry for not being there for a time. The only time my husband gets to spend time with Mack is when he’s asked to do a project at Mack’s house. He is not invited to any social events. We’ve asked to take Mack’s family to dinner, and he won’t give a straight answer. My husband is so hurt. He wants to get to know Mack and his grandchildren, yet he is kept at a distance. We are at our wits’ en…