Any small gesture you make will go a long way. Offering to look after the kids even if it's just chasing them around the park for an hour will surely help out... doing their lawn a week might help free up some of their time... little cards and notes are a great way to lift someone's mood.

even though you've put the gesture for help, she's unlikely to straight up ask for it.

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When you get to the end of your rope, tie a knot and swing.