The word "litem" refers to a person who is appointed by a court to represent the interests of someone who is not capable of making their own decisions, like a child or an incapacitated adult. Full definition
She has served as a mediator, arbitrator and guardian ad litem in family court and probate cases. (lipsonneilson.com)
A former mentee of mine, who is developing a thriving practice as a guardian ad litem in private custody cases, recently asked for my opinion on whether guardians should give opinions. (gregoryforman.com)
The bill makes it a felony to harm or threaten a lawyer, corporation counsel or guardian ad litem for work on a family law case, the Wausau Daily Herald reported here and here. (abajournal.com)