I am helping a friend out with her tree and she found someone who is younger than her supposed son. Is there a way to find the correct timeline order?
This is not a problem that FamilySearch staff is ordinarily responsible for. Somewhere a mistake has been made—either in the sources, the lineage, or data entered by users. This is the type of issue that makes genealogy more of a detective story than an orderly process. You might try looking back a couple of generations at sources and make sure they all make sense. Perhaps the "son's" profile actually belongs to another parent. There are many possibilities to check.
First you, or your friend, need to work out what the problem is.
Is the mother's date of birth wrong? Is the son's date of birth wrong? (It could be as simple as someone typing 1872 when they meant 1827) Are these two, real people with the correct information, just NOT mother and son? Any combination, or all of the above?
Assuming these two people are both deceased, if you post there IDs here someone may be able to offer some more specific advice.
@Talbot, Cambria Elise You may be interested in the these Learning Resources if you are new to FamilySearch's Family Tree.