Lori - do you use a hugabub or anything? If you're wearing him, no-one can take him

Only you know how your DS could react to people. If you think he won't handle it, then you need to work around that. Perhaps you can attend the service as a family, but before people can rush over to take your DS, get out of there! So you can both be with your DH through the service, and then leave him to mingle with the rellies while you take DS home for his 'nap' hehe.