All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.

Your question lacks details, therefore I cannot give you a specific answer. But generally speaking, marriage does not prevent someone from participating in legitimate jihad, it should increase his reward even as it would mean sacrifice of family and children. But whether this jihad is legitimate and worthy of sacrifice this what needs to be decided on getting to know the country and circumstances and needs of the people.

Allah Almighty knows best.