Welcome to D&D @Chetaknn. 
In the Vinaya Vibhanga we have cases of monks and nuns who were once married.
As far as I can tell it is totally fine for someone to leave his spouse and children to ordain as a monk or nun.
It is of course clearly expected that by taking up the robes and the mendicant lifestyle means one does not see himself or herself as part of his or her previous family.
In the detailed analyses of the rules there is mention of offenders who were previously married and either had intercourse or lustfully touched their previous partner. And that surely was taken as wrong.
When it comes to the steps leading to that decision, each case is unique in reality and it is worth making that a very gradual and fully disclosed move.
By doing so the one going forth does not trigger in the one left behind any negative response or aversion to the Dhamma and associated right livelihood inspiring the move.
The best case scenario is one on which the move only serves to increase the faith in the Triple Gem and their commitment to support the Sangha of Bhikkhus and Bhikkhunis.
