You can mow lawns, shovel snow, baby-sit, do odd jobs for your neighbors. The most important thing is to stay in school and get your education. After high school there are scholarships, student loans and grants that will get you through college. Your mom should be receiving child support from your dad, or benefits if he passed away. If they are depressed about the situation, they should call the local mental health agency and inquire about family counseling.
Help is available for low-income families.
The will help find a therapist that will charge based on what you can pay or free. Fun activities don't have to cost money. Walks in the park, picnics, school ball games and board games are all fun activities for families. Check your local newspaper for free activities too. They usually publish weekend activities in the Friday paper.