Mummy's agony

It's not easy being a mum and apportioning your love equally between your kids without one feeling unhappy.
Nana has been clingy to me when i am home. She wants me to be in sight and often yearning for a long warm cuddle or hug. She gets jealous when Aaron comes over and I show him attention.
Aaron also demands mummy's attention and gets upset when mummy hugs Nana instead of him. Lately, he has been throwing tantrums and up to no good. I think it's bec he is seeking attention. Been wanting to scold and spank him but WAIT... is there something lacking in his life? Am I being biased when showing affection? What's wrong????
Mummy is feeling extremely exhausted balancing work, family life and balancing affection amongst the 2 kids.