It is common for a spouse, your mom in this case, to review their estate plan when their spouse has passed away, your dad in this case, with the same lawyer or law firm. From what you stated, your mother appears to have inherited all the marital property from your father, which is also one of the most common distribution schemes. When your father passed, your mother's estate plan has become somewhat out-dated and she may have wanted to or was advised to update it, also very common and the...