i had it first is solve by flipping a coin in my house - followed by timers for taking turns.

first, I tell them "angie really don't know who got it first". and i said here - see this coin. we can toss the coin ---- the girl side --- (25cents) is in favor of karlina and the moose side is in favor of ben.
I give them time to absorb what i just said. i'd ask them who gets the toy car if the coin landed on the moose??? once the agree, who get which side, the coin toss happened.

the follow up is to agree about taking turns, this is regular routine at home or library, and both toddlers know what to expect.

if karlina gets the turn first - then she knows that kitchen timer is on for 5 minutes.
once the timer beeps he hands the car to ben, then it is on again for another 5 minutes- till the car comes back to her. But usually, the first 5 minutes, they already agree to share.

outdoors, library for example, they fight over picture books "i get it first". i have a portable timers, and when it is out, they already know the deal.
either one said you can have it first, or the 25 cents come out and decide it for us. then the timer does the job of giving each toddler a turn. s

some days, it work smoothly, some days - i got demand of toss the coin again.
some days, both toddlers get grumpy. but in general, these toddlers know basic conflict resolution - 5 minutes each turn.

angie