Working Mom looking for friends and motivation

I am a full time working mother of 2 beautiful children. I am looking to lose 50+ lbs. I lost almost 50 with Weight Watchers and have recently gained back about 30lbs. My weakness are the evenings when I get home from work and the kids need help with homework, dinner, getting ready for bed, etc. I also have a hard time with weekends.

I need help with motivation to get through the weak times. I am really hoping this work this time. My goal is to lose the weight and have a lifetime of healthy living.