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You may have a financial interest in the property if you have contributed towards it and you may be able to make an application to court under part 4 of the Family Law Act is your son as a child of the relationship or has been accepted by your partner as a child of the relationship..
As you say your son is 28 years old, and it’s not your partner’s child, your partner is actually at liberty to exclude the child from the house which you may not want so on a practical basis, even if you get a part 4 order to stay in the house, it’s not practical and in any event would you really want to continue to live in the property under a cloud.
However the right to live in the property and any financial claim that you have against the property is a different thing altogether and any financial claim would depend on what you paid towards the property.
Indirect payments such as shopping and bills would only be taken into account if without those indirect payments, your partner could not afford to stay in the property.
I’m sorry, I know this is probably mostly not the answer you wanted.
Thank you for letting me assist you with your legal question. I am glad that I was able to help.
I am not certain whether that answers the question for you or not, but I am happy to answer any specific points arising from this.
It will be my pleasure to help you again either further with this or any future questions you have