Which spelling for baby girl's name?

Samantha • Mama to two beautiful girls. 22 months apart. 💜☀️😍
My husband and I decided on the name Alison Grace for our daughter that's due on the 29th. Aubree Lynn is our 22 month old's name and we thought the two names went together nicely. Anyways I wanted to spell Alison with one L but my husband all of a sudden thinks it should be with two L's... Suggestions??? 

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