The American Heart Association now offers Family and Friends CPR kits.

From the aforementioned link:

Family & Friends CPR Anytime is a self-directed, personal CPR kit that makes learning the core skills of CPR easy, convenient, affordable and fun for the whole family. It takes just 22 minutes to learn and can be done anywhere.

This in-home kit does not provide a certificate, but it is a good starting point, especially for busy moms who might not have time to go out to a longer course.