When my 94 y o JW dad died in 2016--i checked his will--there was no mention of funeral arrangements, so as there was no one else to make the arrangements--i did it all. I met with a funeral director--and explained i wanted no religious service whatsoever.
I never told his congregation he had died--or his grand children--all JWs, who had never visited him in the care home--or for years before that.
I went to the crematorium--along with 2 friends of mine--both ex jw. A couple of the carers from the home went. The coffin was bought in--the funeral director said there would be a couple of minutes silence for reflection; the curtain closed in front of the coffin--and that was that.
i think of my dad quite often--and i believe he had a lot of doubts about the religion--but he kept it to himself. The congregation was well aware i was very close to my dad--and he never shunned me.