We went to an all inclusive resort, but it was for adults only (not XXX ! !). Mexico was safe and the natives told me the unsafe places are within 100 miles of the border. We were greated very warmly and the mexicans treated us very well because they make their living off us. With out us, they wouldn't have a job or would be doing meanial jobs.
To find inexpensive, all inclusive, kid friendly resorts I searched www.cheapcaribbean.com. They have a section for all inclusive, kid friendly resorts. http://www.cheapcaribbean.com/attractions.jsp?attID=331
We had a wonderful time. For 6 days you can go on a Disney Cruise. Or you can find an all inclusive kid-friendly resort. Either way the kids will have plenty to do. We took our kids on a princess cruise. They went to the kids program in the morning and we picked them up in the evening just before dinner. My kids had a blast. They could hardly wait to finish breakfast so they could go to the kids program, and didn't want to leave with us to go to dinner. The adults managing the kids program were all educated in teaching kids. Some were teachers, some had child psychology majors working towards their degrees. The four cruise lines that are the most kid friendly are Disney, Princess, Royal Caribbean, and Carnival.
I just looked on one of my internet sites. Royal Caribbean leaves out of Port Canaveral, Florida for a 7 day cruise for $519 per person for the first two in the cabin. The 3rd and 4th person were $200 each. Taxes and port charges are extra.
Good luck to you and yours. (If you want more sites e-mail me.)