Is there any way to salvage or save our relationship?
There is nothing to save as there is no relationship.
A relationship involves the effort & cooperation of at least two people. If only you desire to build a relationship, but your sibling(s) do not, then you will continue to be disappointed, frustrated and probably depressed over the situation. You can only control your own actions, not the actions of others.
As already mentioned by others, move on and create a good life for yourself, involving people who like, respect and love you for who you are now.
If your siblings later have a change of heart and attitude and pursue a relationship with you, you may then choose to agree, but that relationship will be based on terms that are agreeable to both/all parties.