If you've been thinking about asking your parents to borrow money, consider this: In the U.S., one in 10 homeowners say they aren't comfortable with their retirement savings and haven't been able to save enough as a result of supporting their adult children financially.

That's according to Unison, a San Francisco-based home co-investment company, which surveyed over 2,000 U.S. adult homeowners about the impact of close financial bonds between adult children and their parents. The survey features respondents who have a household income of at least $50,000, have owned a home for at least 10 years and are not retired.