Guys I need help asap

I’m not allowed to be dating my boyfriend because my dad is horribly racist (it’s awful) and my boyfriend is black. So we’ve been dating kinda in secret for awhile now.

I haven’t seen him in forever so I made a little present thing for him in my notebook, which had like pictures of me and explained different times where I missed him. It was cheesy, but my bf likes cheesy things like that. So here’s the problem:

My brother looked through my notebook one day, and took pictures of everything. He’s holding them against me.

I need to like get into his phone and delete them all, but I don’t know how.

What would you do?

Please please please offer any help, don’t hate because “I shouldn’t be dating my boyfriend” or “I shouldn’t have those things in my notebook” I get that already you don’t need to remind me.

******my brother is 13