V.N.
Hello,
This is from a friend who has lived there for a couple of years.
"I would recommend that she avoid summer (mid May-mid Sept) which will make the kids very uncomfortable and antsy from being inside all the time. Several activities/events only happen in the winter so it will be easier to find things to do during that time.
Dubai is kid friendly, although several hotels are very business oriented so check first. There is a severe housing shortage so it is unlikely that you will be able to rent a house.
As a resident of Abu Dhabi, Abu Dhabi is a much more family-oriented city with a bit of a more relaxed pace. It's about 70 miles from Dubai with a major international airport."
Good luck it is a beautiful place.