Just to be silly for a moment.....
We all know that Celeborn was a bit of a stand-up comedian, after all his 'old wives' comment was the funniest in LoTR.
In the scene we are discussing, he's giving Aragorn a bit of grandfather-in-law-ly advice after his wedding.
Quote:
May your doom be other than mine, and your treasure remain with you to the end
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What he's saying her is 'don't let Arwen wear the trousers in the relationship and don't let her spend all your cash'.