Travelling with children

Hello
I am a mother of 2 kids, and currently married to the father of my children. I am currently contemplating divorce/sepration from my husband due to a bad relationship with my husband, outside inteference from his parents, and a lot of misunderstanding and communication. I feel I need to take a break and travel with my children to the the United States from Canada(I currently live in canada), to visit some family and clear my family siutation from a distance which I feel is better for my situation. I cannot resolve any issues here with him and his familys consistent interference, trouble making, and a lot of bad feelings. I am alone in this city, and really wishing for some family support. I wish to take my children with me to the seattle area. Is there any legal document I can get to enforce the fact that I wish to travel with my children? what must I do in order to obtain this ? what if my husband doees nto wuish for me to take the kids to the US? Howeverr, I feel it is in the best interest of the children., away from all th family prolems? please advise me
I am by far the parent who takes care of them most, they barely see their father and I am consistely loving them, catering to their needs, and assurnig them everything is Ok. - Is this your question? Add additional information