I have 2 daughters. My 4 year old was complaining that the 8 year old wasn't playing with her. I asked if she wanted options on what to do since it seemed she was having a problem, she said yes. Option 1: Some girls might ask their sister politely if they can play whatever she is doing. Option 2: Some girls invite their sister to play with them in whatever they are doing. Option 3: Some girls run around the house making noises and howl like a wolf. Do you need help with the pros and cons of each? Nope, ok, I trust you to do the right thing.
My youngest proceeded to walk around the house making noises, hooting, and hollering. We all fell into pandemonium laughing as she was clearly having a great time. Problem solved!