Is it odd for my friend to send the same photo and messages to lots of different friends ?

[Robofoof]

Not a group chat, these are individual whatsapp messages.

Exactly the same thing eg look what my DS made in school today, type of thing. The same conversations with different people.

Odd?

It's not much different from sending it to a group chat, except you don't need those people to have to start another group, so no not weird!

Have you started a thread about this before OP?