Hehe sounds like my boys. Sibling rivalry might be kicking in, along with the age.
I found semi-directing helps. Given tasks to do, whether helpful or playful gives them a sense of achievement and some structure. Roaming around the house trying to find something to do is not good day after day.
Perhaps you could make a schedule, loose or strict. That would help you and you'll know both boys are having some mummy time.
I find it so easy to rush everything and not give proper attention to anything if i don't have a rough schedule for the day.
Its awesome that you are taking them to the park. So good for them to have fresh air and learn how their bodys work- running jumping etc. your doing a great job

Sent from my Galaxy with the barefoot princess covering me in kisses, so please forgive the mistakes