Full Idea
When you hold your child, you do exactly that - hold the child himself or herself - and not some stand-in. This implies that we are not two substances, and we are not mental states nor akin to software.
Gist of Idea
You hold a child in your arms, so it is not mental substance, or mental state, or software
Source
Trenton Merricks (Objects and Persons [2003], §4)
Book Reference
Merricks,Trenton: 'Objects and Persons' [OUP 2003], p.85
A Reaction
And it is not just a brain, either. This is a nice simple example to support the sensible view that a person is a type of animal. Like all other physical objects that is a bit vague, so we should not be distracted by borderline cases like brain bisection.