Well with regards to baseball, one good thing to help is getting a pickup game of wiffle ball. That is always a great way to get started without pushing. If you have other kids in the neighborhood you can get them out there. Because it is wiffle ball you can also get a kids vs parents game together.

The biggest thing is to try and get it to be a fun experience and that will generally peak the interest.

Also if you have a AA club in the area you may be able to arrange for your kids to meet and talk to the players and they can ask them why they like the game, that could also help.

Good luck!

try to play the sport with them. make fun for them at first then make it more chalegenging later on. So they'll keep trying and trying until they get it right and presto they love the sport. Hope this helps.

See if any of their friends are playing sports and have them play with them. Find a really fun camp for them to go to with kids their age.

Maybe what you can do is give them more hands-on approach. Let them practice several drills. Have them field ground balls, flyballs or let them hit toss ball. Give them fun baseball drills so they enjoy the skills basball brings

http://www.softballperformance.com/7-softball-hitting-drills-to-spice-up-your-practices/

So you really HAVE done everything you could to get them to like it... except play the game! Don't go CRAZY and overwhelm them when they are supposed to be having vacation! Ask them if THEY would like camp! But don't expect YES! on the first try! Make sure they have a fun and pleasant experience with baseball/softball not an overwhelming, annoying, and boring one! So take it easy, but remember if you are having fun chances are they will too!

If they are not already on Weplay, help them get accounts here. They will see lots of other kids that love playing sports. As they start playing, you can give them Props to encourage their achievements and growth.