be nice to them, and treat them as your own, they need this at this time when their own mom has brain cancer.
they will remenber your kindness, and return it when you are old.
my father is a step father to my two brothers for over 50 years, he never ever lost temper on them, and they get along so good.
get them involved with what you want them to do, talk to your hu*****and about how to raise them, and you should know at this point that they will stay with you for the rest of their lifes in the future as their mom is not doing well.
be nice to them, if you cannot, leave this marriage, do not hurt those innocent children.
