RIR rooster and Dutch bantam hens

[FeatherstoneFrm]

Just trying to be ahead of things. I have a large RIR (I think) rooster, 2 adult hens, and 10 16 week old babies. 9 pullets and 1 bantam Cochin cockerel. Of the 9 pullets, 1 is a Cochin bantam and 2 are Tiny Dutch bantams.
Is my big rooster going to try to mate with the tinies when they mature? It is it possible he might be content with the standards and let the little rooster have the bantam girls?
In the picture. All except the bottom left are 16 weeks old. You can see how tiny Pidge and Midge are.

Any thoughts?

 

[sourland]

Have a 'Plan B' in mind just in case he tries to breed the smaller hens or eliminate Harry from the flock.