grandmother to accompany my son to US

[LMT 0]

hi everyone!

i'll make the story short...me and my son are in the philippines with no tourist visa. my husband is a US permanent resident. my mother has a 10 year multiple entry visa to the US

i have scheduled for a tourist visa interview for my son (3 years old) because I want my mother to bring him to the US when she visits my in-laws there. the reason i stated in the aplication form is grandmother wil bring my son to the US to visit relatives.

would there be any conflict there? because some people are telling us that maybe the consul would cancel my mother's multiple entry visa when they see that we are trying to bring my son there (they say they might think we are trying to bring him there to leave him permanently)

in reality, since it's almost impossible for me to get a tourist visa (since my husband is an LPR), my mother is the only way I could have someone bring my son there to visit (since my in-laws who are US citizens haven't seen my son since he was born)

and is it really hard to get a tourist visa for such a young child (3 years old)

what do you guys suggest?

anyone with a related experience? thanks!