Is your spouse the kind that puts monetary worth above other things in life? Some people are like that and when you are living with someone that’s like that, then there is no room for things which you cannot attach a monetary value to. Unfortunately for you, if your mom does spend her money and come she is bound to be left feeling like she is disrespected. If you pay for her tickets and bring her, she is going to get disrespected in your house. It’s better for you to drop plans of her travel and go spend time with her. If I were in your situation, I would leave kids and go spend a week or two with mom, rejuvenate and come back. I need time with my parents and if someone was unwilling to pay for her ticket, I would go to her house and stay there. I know I’m welcome there with open arms!