Single toddler mom needs help

Hi Reddit, this is my first time posting and actually using this platform, so sorry and thank you in advance. As the title says, I’m a single mom, I have my son who’s almost 2 years old and I work full time. I don’t have a maid so I do all the chores myself. I recently started to gain weight and I’m starting to hate my body. I do want to join a gym and start working out I really want to lose weight but I don’t have the time to do so. My family keeps on pointing out that I’m fatter than my sisters (side note: I’m the only sister who got married, pregnant/ have a baby, got divorced.) before the marriage and pregnancy I used to weight 53 kg, worked out 6 days a week/ twice a day. Now I’m 66-67 kg and I hate it. Reddit PLEASE HELP ME 😭😭.