My Aunt is 93 and would like to be Sealed to her deceased husband and two deceased children.
@Johnson, Minnie Marie_1
Welcome to the "Community.FamilySearch" Forum.
I am just another 'lowly' User/Patron ...
[ And, I happen to be a Member of the Church ... ]
Short Answer: You DO NOT.
Such CANNOT be handled, through 'Family Tree" of 'FamilySearch'; as, such is considered a "Living" 'Ordinance'.
Here are some "Knowledge Articles" in 'FamilySearch':
Your Aunt needs to
▬ "Hold" a CURRENT "Temple Recommend".
▬ Counsel with her Local Priesthood Leader (ie. Bishop; or, Branch President) in the first instance.
▬ Receive, a "Recommend for 'Living' Ordinances" (as, she is "Living"),
▬ Once, all that is done, make an Appointment, with a "Temple", for undertaking, "Living Ordinances".
I hope this helps.
ps: I am sorry I was having trouble locating that THIRD "Knowledge Article".
Sealing to deceased family members
Living people can be sealed to deceased spouses, parents, and children. Generally, this ordinance would occur at least one year after the family member’s death, and after the other temple ordinances—baptism, confirmation, initiatory, and endowment—have all been performed.
If a worthy member dies within the year after being baptized and confirmed, the sealing may be completed when one year has passed from the date that he or she was confirmed. For more information on this policy, please consult the Church’s General Handbook: Serving in The Church of Jesus Christ of Latter-day Saints, 28.3.2.