Hi corinnelisa,
I have a brief link to Shimmin in Douglas on my gt-grandmother's side of the family.
I don't have my research to hand but her cousin was called Mona and she married a Leslie Shimmin, I believe they ran a B&B in Douglas. They were unable to have children so there are no living descendants on that particular line. I guess Mona & Leslie were living bet approx 1890's-1970 ish. I do have a photo but not much info on them. I don't know what part of The IOM Leslie Shimmin was born at present.
Sorry I can't be much help but as you were asking I thought I'd mention them :-)
Best of luck, Val.