Can't connect to WIFI

I'm connected, my device & WIFI show I'm connected, however when I try to use a onternet browser it states Network error. Check your network connections and try again

Please help I have 2 tablets 4 my G kids. Plus the gmail account my husband used, when setting tablets up, he forgot the password...... ugh. Christie & Craig Cooper 559-284-6684. Craigcooperlt@yahoo.com