Get something you can live aboard, sail and entertain the kids
and others on. I'd suggest a small Prout but I'm biased. The kids will love it, the ex will hate it but will understand that it's not as dangerous as driving to get there.
Finding a decent mooring
is tougher but it's still cheaper than living ashore once you've paid maybe 30k for the boat
plus improvements (solar panels
etc). The mast
can be folded forward on the Prouts so inland motoring is possible to find that cheap
convenient parking place.
Learn to sail with the local nearest dinghy
club AND a decent yacht club. The skills are different and introducing the kids to dinghy
sailing should do them good. The social side will do you good too, at either. Make your dream a lifestyle, you may have been forced to make the first step, shedding ballast, but you still have a life, just need a well hung set of sails
to fill it with joy again.