
please dont be offended by anything that i might say...im not authority on anything...and the last judgement, of course, lies with Allah!!
for starters, there is no marriage between these two if the guy is non-muslim or an atheist...a muslim girl has to either then consider herself excluded from the mainstream islam or else she has to convert the boy so that there is s validation of their nuptials..otherwise, nikah between a muslim and a hindu (and atheist for that matter too) doesnt exist...
i think that as a family, we ourselves only know wht line of action works and what dsnt...but as a muslim, its ur duty to at least tell the girl what is the status of her marriage in the eyes of the family, who like to practice the dictates of Islam...at least do ur duty, and show that u dislike that which is disliked by Allah and our religion...dont be an accomplice! boycotting the girl? i guess, verbally u already might be doing it but potentially, how long do u think the child will survive without family...difference
s arise in married lives, somebody will have to be there then!!
and ur right, as a mother u have to accept ur daughter, but remember that u might forgive/accept her, but neither the world nor afterlife will remain a bed of roses...one day this mistake will ricochet...as a mother ask ur daughter to 'think' about converting that guy, if he is sincere to continue a relation, he will do it or at least think over it...even if he does tht on superficial level! Allah is the best judge of any one's imaan!!