I sometimes feel like a "stuck-at-homer," hubby and I are on disability for pain and mobility issues. We don't have kids, just a really crabby, demanding fat, old cat. My husband and I both have good days and bad days because of our health problems (his issues worse and are more consistent while my issues tend to fluctuate more. My really bad days are worse than his, but I have more good days) - and it does seem that our best days rarely coincide. So on a day I feel up to and interested in going out and doing something active - hubby isn't and vice versa. When we do have a day that both of us are feeling good - sometimes we overdo the activity or end up doing something celebratory (and not necessarily diet-friendly).
Without the demands of taking care of children, you'd think weight loss really would be easier, and in some ways it is. It just takes a lot more planning, and a lot more diligence against boredome eating, because the food is always so close.