Hi there missinghome. I just wanted to tell you a bit about where I am and where I've been this past year, I guess to help you feel that you're not alone in your predicament and maybe to give you some perspective.
I am English and met my Aussie DH in 2008. We got married and had two children and built a life for our selves in the UK. The possibility of living Australia was always there but we didn't really do anything about it until after our DD was born in 2015(by this point he had been in the UK about 12 years). Like you, my DH was desperate to come back to Aus, he missed the weather and lifestyle - not necessarily his family though - but I could tell he was getting more depressed by being in the UK. He would perk up when talking about moving to Aus. I on the other hand liked the idea of living in Aus but don't think I ever actually wanted to leave my family and life in the UK. My DS was at nursery and I saw my parents sister and niece a few times a week or more. I loved my job and had friends... I was very happy. But my DHs sadness really made it hard to enjoy life. We hadn't bought a house or put down an real roots because "what about Australia?".
So here we are in Australia, moved here in September 2016. The last year has nearly killed me! I don't know how I am still sat here on my sofa, living in Aus 🤣 It seems unreal. We visited the UK in September just gone and I do feel it's a nicer life here in Australia, but I miss my family terribly. I was so so so home sick before we went to visit, I was bordering on being ill. But I do feel a bit better about the whole situation now. I have said to my DH I will go until March/April/ May time next year and see how I feel. If I'm still unsettled we will have to go back (my DH is open to this though I know it's not what he really wants to do- but he will have to for my own sanity. As I say this last year has nearly killed me.) My DS who is 4 misses his grandparents so badly, he talks about England a lot and asks if we can go there nearly every other day 😢.
I think I'm wittering on. All I mean to show is that in any international marriage there is someone away from home. For me I feel as a woman I need to be near family. I too worry about my parents and what would happen if one of them got ill or worse and the other was alone... there'll always be a pull for one of you. In the UK it's the pull or your home, in Aus it'll be the pull of his home.
How old are your children and are they at school and have good relationships with family in the UK? Sometimes I feel so bad for taking my children away from my parents, but then I remember
"No matter how far you have travelled down the wrong road, you can always turn around".
You are not alone. And there is no easy answer. Many a visit to Aus would do you well. Think about the quality of your life in the UK. How would life change if you moved?