Husband/Wife/partner/friend/relative test is a good one to think about.
I sent a similar petition about GRA reform a few years back when there were fears of self-ID being put in by Theresa May’s government ….. sweet summer child that I was back then. I could never have imagined the Scottish government (any government!) rowing back on women’s and girl’s rights in this day and age, as they have done 
I remember i was a bit surprised that I didn’t hear anything from two female relatives:
one who works in a caring role professionally and has had some young transmen under their care.
one who has told me she has seen online abuse against their colleagues in their professional role when colleagues had spoken out against new workplace policies where the management were putting gender identity politics inappropriately into the fabric of the job.
…I’ll never know if they signed or not of course but the fact it wasn’t mentioned by them makes me wonder. Were they feeling ’mean’ about signing, because of feeling protective of the ‘most vulnerable’ group in society? and/or had had fears of professional repercussions for signing?
It can be hard to convince some women even of the misogyny in society (especially if they have been lucky and haven’t yet gone through some of the undeniable experiences like pregnancy and birth as a working woman). Some of us find sexism is just too big and painful to really face up to as a systemic problem, preferring to see it as an individual dickheads’ problem (I used to be like this!)
And also some people don’t realise that unlike other petitions, Parliament doesn’t share the petition signatories’ names. All signatories are publicly anonymous apart from the name of the one person who started the petition. It would be highly illegal for any personal info to get into the public domain. You can bet that security is pretty tight on the Parliamentary systems given the highly controversial petitions that they handle day in and day out.
I’ve gone back to having quiet conversations with individuals about my own concerns first, then sending them a petition link for the individual to consider. Apparently that’s worked well although we’ll never really know who signed, which is just as it should be. [Flowers] I’m just so grateful to everyone that has signed and to whoever started it.