The story of millennials in the last five years has mostly been about being mired in student debt and the inability to move out of their parents' houses and start a family. But as this age group reaches early to mid-thirties, that's starting to change.

Previous studies have shown just over a third of adults aged 21 to 45 receive financial support from their parents, and that adults aged 18 to 34 are more likely to still live with their parents than with a spouse or partner in their own household.

Now, a 2015 Ameritrade report suggests 19% of millennials are actually financially supporting their parents to the tune of $18,250 a year. For most millennials, their parents are either at the end of the silent generation or at the top of the baby boomer generation, which means the eldest millennials are starting to feel the sandwich of taking care of young children while also supporting aging parents.

This could be an indication that multi-generational houses will only continue to rise.

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