I am in the reverse situation. I live and work in Thailand with my wife of 5 years, and we have a young 2 1/2 yo daughter. My wife having her child here is not a problem, though a very expensive one (unless you are loaded, or wish to use a cheaper public hospital for the birth, pre,and post natal care - NOT RECOMMENDED).
Our child is at the age where school is the top thing on our minds, and quite frankly, there is NO FRIGGING WAY in this lifetime will we put our child through the public school system, and the private / international schools are far too expensive (think 30K US per term for a decent one). We are moving back to Canada to provide a much better future for are daughter, and my wife - the day cannot come sooner.
Already on several occasions close 'family friends' have tried (unsuccessfully) to abduct our child while visiting the grand parents. This and an endless amount of jealousy from relatives are driving us insane, and fueling our need to get out, and get a stable life back. If you think your wife's family are there to help, I am sad to inform you it could change rapidly once the child is born - especially if the grandparents wish to 'take' the child and 'help' raise it after birth - getting the child back after may prove to be a fun, and frustrating process.
This is only my experience talking here, but mirrored by others with similar events. I wish you the best, and hope you have a healthy baby!