OP has twins.........hmmmmm........I'm sorry, it does get easier as they get older! Just remember twins are two time the work, and four times the fun. Even when 9 months old, both have the trots, and you go thru 500+ diapers that week!
There are MANY boats in the 28-32' range, that cn be had for $15-25K and will work well. Ericson, Islander, jeanneaus,Benateaus, Hunters, Catilinas, Cal, Pearson, J boat, san juan,........list can go on and on. It will depend on ho well they are kept up, "ran hard, put away wet!" ie raced, vs cruised/day sailed. I found an older 85 Jeanneau Arcadia, 30' long, original owner, well taken care of overall. I have done a bunch of up grading, but overall, a fairly roomy boat for being a small 30' boat. Along with being reasonably fast for her size. I ws not looking initially at Jenneau's, but saw one locally on the local yachtworld equal, looked at her, spouse fell in love, boat was ours a few weeks later.
So now I have a weekend project if you will, while she plays in the yard, and we both take afternoons to sail and race, my mostly with my 19 yr old daughter, and 21 yr old twin sons, along with tenuki upon occason. Still trying to get 15 yr old daughter out there. Enjoy your time with the kids, they do grow up fast!
marty