This is the great uncle of some friends of mine. His sealing to parents was reserved in 2017 then released to the temple 2 years ago. It has not been done, so is there any way the family can recall that for them to do?
Here is information from a Help Center article suggesting how you can request ordinances be released to you. It is titled, Someone has reserved an ordinance I want to do.
"If the ordinances for one of your ancestors are reserved, you can contact the person and request that they share the ordinances with you. He or she can unreserve the ordinances, allowing you to reserve them for yourself.
We have found that most people are very happy to release reserved ordinances to you, knowing they will be completed much faster than when shared with the temple.
We hope this helps.