Hi, I don't know everything but I'll help you as much as I can...
1. Do you think it will be too difficult for a 9 year old child to study in French/Dutch school and it is better to apply in English schools as my kids are really good in English and they have no knowledge of French/Dutch?
It depends, but imo it won't be difficult for he/she to learn a new language. But I know some children from expat parents who've had difficulties to learn french, the teacher just asked the parents to talk to them in french and not in the native language.
2. I searched online and see that English schools are pretty expensive. May I know if there are some other English schools also in Brussels which may not be posted online and which will have less fee?
For what I've been looking for, I only found expensives schools too .. So maybe someone else could help you better with this question
3. Are there any localities where lot of Indians live so that we feel at home? Are those localities safe? What about safety in Brussels in general?
I'll say that the most indians I know are from Ixelles ( it's 1 of the 19 municipalities of Brussels ), but I don't know if that's the place where they are the most representated. For the safety it all depends where you go, every municipality has its beautiful and dangerous hoods.
4. May I know the approximate rent for a 2 bedroom apt?
Depends in which municipality you'll go.. but I'll give 600 - 700 EUR as average price, most of the time there's no: gas, elecriticty and water included.
5. Taxes are also pretty high it seems. May I know what benefits we get for paying so high taxes? Will medical facility be free? Will I save tax on fee paid for education of my children? Are there any ways to save tax for an independent professional (freelancing)?
Hell yeah, welcome in Belgium.. if you've a high pay you can lose 50% from you gross to your net. The advantages that I can remember right now: low costs for studies ( 700 - 1000 EUR fee for university ); a lot of that money goes to the public welfare center; a good social security for you retiring;
For medical costs you have to take a mutuality, imo it's not that expensive compared with other countries in europe.
I don't how it works for independents, sorry
6. Can you give me rough idea of cash in hand after tax if I make EUR 5500 per month in gross?
as an employee, I'll say 3400 EUR net
7. May I know how much will be approximate expenses for a family on food per month?
Depends on how you eat, if you go every 2 days to a restaurant, you can spend a lot .. We spend something like 350 EUR/month and we're three..
If you have any other questions just ask