Attitude breeds forward from both parents.. and Stew Pidasso hens should not be bred from anymore than an aggressive rooster. BUT if one is a victim.. the other cannot be blamed for the outcome per say..
EE cross.. sire.. cruddy egg production outcome at best. IMO.. forget hatching.. eat those eggs and add in a couple sexed pullet chicks that will lay better from the feed store/hatchery.. in a breed of your choice.
No point hatching barnyard junk IF the point is production.. If it's just for fun, that's a whole other story!
The Marans hen will NOT be "said mother" unless
she goes broody and adopts the chicks.. some will co-parent.. though it isn't extra common and also not generally recommended.. My hens beat up other hens chick.. my roosters generally protect chicks.. I haven't had the fortune (or misfortune) of having a rooster go broody.. my broody hens do attack people ONLY when broody AND also provoked.. but a rooster or cockerel attacking humans is SOON to freezer camp.
Noting I take my flock antics very personally.. and while I know it always rolls down hill with a little bit of pecking, intimidation, etc and is tolerated.. I draw the line at bullying.. and NO bully welcome in MY flock period.. They will be re homed with disclosure OR take a long hot soak with aromatic veggies on top the stove.. USUALLY (with good set up) larger flocks are a bit more well balanced with more souls to spread the love around on..
My suggestion to a friend.. unless you NEED or want the hatching experience desperately.. I would buy better genetic chicks.. and EVEN if I was letting a broody raise them.. I would tuck them under AT the right time.. Noting broody are not delightful flock members ever.. and rooster still call the hens to eat before the chicks. Meaning there are no perfect answers.. and I've probably helped you overthink it well enough now to make you own informed decision!
Must get more chicks, when ready!
