How do funeral homes get the corpses' hands to remain in place?

It's called rigor mortis. Have you ever touched a body in the casket? They are hard as a piece of marble.....nothing is moving.

During the embalming process....."Rigor mortis (stiffness) is relieved by massage. (Rarely but sometimes, tendons and muscles are cut in order to place the body in a more natural pose if limbs are distorted by disease, e.g., arthritis.)"

When a person dies there is something called rigamorphoses,

that means the stiffening of the body, most funeral parlors place the hands on the chest before this happens so that when rigamorphoses sets the arms are in place. You can try to loosen the grip of the corpse and there is no way you will be able to move them

Well if they're placed in a coffin, rigor mortis (stiffening of the body) would have set in and that will hold those hands in place.

hands are posed during the embalming process. the tissue then "sets up" and the hands remain in place. know because i used to do it.

Glue and breaking the bones to get them in the right position.

i have heard, but i am not 100% sure about this, but once the limbs get stiff, they have to inject a chemical into the muscles to relax them and then they can lay the body out.

Glue I think. Same stuff they use on their mouths to keep them shut.

They probably use a bit of glue.

They break their hands.