Sharing with Siblings
Nothing wrong with wanting your child to share, but the word "share" on its own may not have any meaning to your child.
So, instead of telling them "Share that with your brother" or "Can you please share that?"
Teach them how to share, by using a timer and saying:-
"you both want to use this, you can do that by taking turns, here is how. You can use this first, when the timer has finished, you say. all done"
You can use visuals to help them and yourself, who's turn is next. By having either a toy to represent them lined up in order of turns, or a photos, or name on a board
You're providing clear guidance and direction, along with encouraging direct communication.
For non-verbal children, using the timer and visuals along with words and/or symbols saying "share" can also help.
Getting your child to communicate about their day
How many of us parents have picked our child up from school and asked "how was school today?" and your child either shrugs, or says "...ok" or "I dunno"
When we ask our children questions they know they have to give us an answer, but they may find it hard to communicate all the things that have happened from one short question.
So try asking specific questions:-