Its illegal to live together in dubai if you aren't married. People do do it, without dc in apartments but they tend to be both working and have visas etc through their own contract. A single man cannot have a live in maid for instance. your dh company will not pay visas, health insurance, flights etc if not. Its not worth the risk of being imprisoned, fined and deported.
The points listed below, this is my take on them:) having had the same age and age difference dc in the ME, it is too hot between April and October. The heat is relentless even early in the day and within an hour everyone is too hot and moaning. Even the water in the beakers is too hot! The locals mostly take their dc to the park ( and some parks are women only during the week) in the evenings.
Schools, british, have full classes of about 20/25 children in a class, and teaching can be good or bad, same as anywhere. Teachers will be british, Irish or Australian. School places are very hard to get, you will, unless your company has a debenture, have to pay a fee of about 1000 aed now to get on the wait list for 4 years time. If you look on expatwoman they list schools and fees. Plus lots of other info. Also look on expat forum for a less moderated view on real life in dubai:)
Nurseries are very over subscribed with perhaps 20-25 children doing full days and most people put their child in as its seems the norm. Its very expensive, certainly not cheap! And you will struggle to get a place. Some companies don't pay nursery fees. Staff will be one or two westerners, then Indian or Asian as the cost then is extremely low and staff may not be qualified. You pay for all extras.
Agree healthcare is excellent, depending on who you see. You won't have to wait at all, and dental care is fast too, if you have it with your healthcare.
Taxis I found to be dangerous! Taxi drivers don't speak much English and unless you are going somewhere they know, will get lost. People take tremendous risks whist driving here, and every second car is a 4x4, safer and you are less likely to get cut up. Traffic is horrendous.
Help with kids- not everryone had a nanny. A nanny is the name given to an unqualified Indian, Filipino or African maid who looks after your dc. I know loads of people without a nanny. If you plan to work you will need one though.
Look on dubizzle for cost of housing versus your housing allowance. You don't pay income tax but as I said below, there are lots of hidden costs. If you can rent someone cheaper than your HA, you will save more.
Lying on the beach with a cocktail is ok if you pay to do so by going to a hotel after work. You may do that and leave your dc at home for the maid to feed and put to bed, or bring the dc and let the maid look after them. Your dh will certainly like his new lifestyle after work:) the beach at weekends is great, plus camping.
People tend to leave when their dc start school as its so expensive, and I know loads of people who leave because the high costs don't really make family living a good thing. I also know people who can't manage a toddler alone at the supermarket:) they take the maid and chatter on their mobiles whilst the maid looks after the dc and pushes the trolley.
It is an experience, but so is brining up your dc in your own country, sharing life with family and friends when dc are little not a bunch of easy come easy go strangers.
It really depends what sort of life you like:) but you don't go for the lifestyle, not with dc. You go to make money and save.
Look on the websites mentioned, ask why people leave as well as stay..
Good luck with whatever you decide.