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I am sure your mom in law will always be pleased to get shots of her grandchildren. Nice looking kids. He looks like he is a handful just looking to get into mischief.
Please include EXIF data if possible.
Take a look at their right shoulders vs. their left. A deeper DOF maybe?
Light is a little harsh. Notice the grey hairs at her hairline that I would suspect are not her's.
Just my nit, but left arms and back maybe should not be cropped out, or maybe just framed that way.
Keep shooting, at least there is no wobble.