I definitely wouldn’t worry about making things fair. Your 18 month old will have no clue and won’t care. Spend on the 10 year old whatever you’re comfortable spending. If you want to get everything on the list great but the list is not an obligation to get all those items! As far as the 18 month old, putting money away in savings is a wonderful idea if you can afford it. They’re happy unwrapping pretty much anything at this age. Take advantage of it!
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