https://www.investopedia.com/mortgage/refinance/mortgage-consolidation/
Consolidating two mortgages into one could get you a lower interest rate or a shorter loan term, which can save you money. - Refinancing from a variable-rate ...

https://www.lendingtree.com/home/refinance/refinancing-second-mortgage/
9 steps to refinance a second mortgage. Refinancing a second mortgage loan is similar in many ways to refinancing your first mortgage loan.

https://www.bankrate.com/mortgages/refinance-second-mortgage/
To refinance just your second mortgage, you'll need to meet typical mortgage requirements, such as having sufficient equity, good credit and enough income to ...