If you shave regularly (can be every day or a few times each week), you may shave after 30 days but not within 30 even if for non-parent and certainly not for a parent. If you normally grow a beard, you may not shave until 3 months have passed since the last time you trimmed your beard (and as long as it is more than 30 days from the day shiva began for the parent).
In case of a large financial loss, consult a rabbi.