It is most definitely true that Irish members of the British military served in India and had their families with them, perhaps one of the most famous examples being the 'madcap'  comedian Spike Milligan, born in India of Irish parents whilst his father was serving in the British army there. (1919 I think). As many know I'm not particularly knowledgeable about 'things genealogical' but for other reasons I have used this web site (link below), not having used it as a genealogy resource I am merely pointing out that it exists, hoping it may be of use to someone.   http://www.indiaman.com/