Official consular requirements require a minimum of €9,870 in a Portuguese bank account. However, we recommend at least €13,000 or more to show you are serious about your intentions and increase the chances of a positive response to your visa application.
Let's imagine that your family consists of 3 people (you, your wife and a 12-years kid).
Main applicant: €9,870
Spouse: €4,935
Kid: €2,467.5
Totally, you should show in your bank statement €17,272.5 for your family application.