" PROBATE CODE
... 6402. Except as provided in Section 6402.5, the part of the
intestate estate not passing to the surviving spouse or surviving
domestic partner, as defined in subdivision (b) of Section 37, under
Section 6401, or the entire intestate estate if there is no surviving
spouse or domestic partner, passes as follows:
...
(f)
If there is no surviving issue, parent or issue of a parent,
grandparent or issue of a grandparent, or issue of a predeceased
spouse, but the
decedent is survived by next of kin,
to the next of
kin in equal degree, but where there are two or more collateral
kindred in equal degree who claim through different ancestors, those
who claim through the nearest ancestor are preferred to those
claiming through an ancestor more remote.
..."
CA Codes (prob:6400-6414)
240. If a statute calls for property to be distributed or taken in
the manner provided in this section, the property shall be divided
into as many
equal shares as there are living members of the nearest
generation of issue then living
and deceased members of that
generation who leave issue then living, each living member of the
nearest generation of issue then living receiving one share and the
share of each deceased member of that generation who leaves issue
then living being
divided in the same manner
among his or her then
living issue."
CA Codes (prob:240-241) Which means that if your aunt and you late mother inherit, you get what you mother would get, were she still alive.