WOW! 7 kids! :shock: Much braver woman than I
I think it's important to get the kids involved with Dad's new job. Make them see that they aren't being abandoned by Dad, but he's out doing his best to support them.
There's always the "map on the wall" Following Dad on his trips, helping plan his next ones and seeing how many different places he goes. Have them start planning for things to do when they get home. Maybe you could all have a little secret and make cards to stash away in his bag before he leaves out again. They could have little messages to call that child and talk to them. Then they'll be all excited waiting on Dad to call