There should not be any problem. You may want to write 2 letters:
1) To whom it may concern - that you and your spouse give permission to your mum to bring your son to USA
2) To a US immigration officer that your mum are coming to visit you and should there is any broblem you can be contacted at ...
回复:妈妈四签终于签成,能否带儿子入竟?
所有跟帖:
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多谢帮忙!有这些信的样本吗?
-poeny-
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06/12/2007 postreply
08:30:42