In-law Dilemma

I got married last month. My father in law and mother in law’s 30th wedding anniversary was in July and my FIL bought my MIL a diamond ring. He needs to make his final payment on it next month and requested to borrow $2,000 from husband. Thoughts? Do we enable the behavior and let them borrow $2,000 or do we let them borrow the $2,000?

We we are struggling because they graciously donated to our wedding and we don’t want to seem ungrateful but also don’t want to enable spending behaviors like this.