Hi, Shirley!

My Martins came from the other direction - Liverpool to IOM. Susannah, Ann and William Martin were baptized at Leeds Street Wesleyan, Liverpool. They would have been contemporary with your Robert. Parents were James and Jane (Collins) Martin. No luck finding them as of yet, but I haven't yet had access to the earlier census data.
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I hope you have some luck! If I find any other good online sources, I'll post them here.

Barbara