1. dont't be upset over someone like that. Plain laziness is her own doing, together with her mum's pampering.
2. Be positive and happy for your son's sake! Kids pick up such 'vibes' very quickly from adults.
3. She's gonna get out of your house already! BE HAPPY!!!
4. Being a stay at home mum is a precious opportunity you will not regret. Just keep yourself updated and go outings with other SAHMs. I'm a WAHM now and I love it!