I have stayed at all the lodges, Boulders several times the last being this past July. I have never stayed with young children but I would imagine if you make them aware in advance they will take care of them. The service is outstanding and they will go out of their way to accomodate but best to ask in advance so they can be prepared. i much prefer Boulders to Ebony but I prefer the modern African architecture and all glass windows with incredible views of river life. Last time on our arrival we saw herds of elephants across the river from our room. Although we prefer Lebombo to Sweeney I think the fact you can rent the entire lodge at Sweeney makes it an attractive option.
Any of the lodges will be great, but I like Boulders the best!