Hi Betty,
I'm not connected to any of yours or Billy's Andersons. I just happened to be another Anderson - only through marriage though!
Denny Cemetery wasn't established till the beginning of the 1880's, so unless any of the stones were to mention someone buried elsewhere, you won't find anybody before this date. I can send you an index of all the Andersons mentioned on stones in Denny but this doesn't guarantee they're buried there. I've spent a good few years photographing and transcribing all the existing stones in Denny but there are plenty of graves without stones too as I'm sure you would have noticed!
You asked about other Denny Cemeteries, well . . . . . . .
1.
Broompark Churchyard, now the Broompark Centre, in Davies Row in Denny (behind the library - if you know where that is!)
2.
Denny Old Parish Churchyard, right on Denny Cross. (One stone only - Margaret Anderson, wife of James Thomson of Carronford, 1844)
3.
Dennyloanhead Churchyard, at Dennyloanhead , in the process of being re-developed. (One stone only - Agness Muirhead, wife of John Anderson, died 20th July 1875 aged 75)
4.
Dunipace Old Burial Ground, right in the centre of the Hills of Dunipace Cemetery on the road to Larbert. (No stones bearing the name Anderson)
All my information comes from existing legible stones,
not from burial records and I must state that sometimes I have to make a guess at dates etc., so anything I've transcribed
must be verified.
Denny Library has a copy of the complete index of the stones which I handed in but I think it's kept 'through the back' and you have to specifically ask for it!

Anne
P.S. I haven't had the chance to go into Falkirk Library yet but it's on my 'to-do' list.