Jean Bond's will left various specific property and sums of money to relatives and friends. She left the residue of her estate equally to her favorite niece and nephew. Which of the various properties described below will become a part of Bond's estate and be distributed in accordance with her last will and testament?

A$.$ A joint savings account that listed her sister, who is still living, as the joint tenant.

B$.$ The entire family homestead that she had owned in joint tenancy with her older brother who predeceased her and that was still recorded as jointly owned.

C$.$ Several substantial gifts that she made in contemplation of death to various charities.

D$.$ A life insurance policy that designated a former partner as the beneficiary.