2 Kittens & 1 Cat Under My Dad's Truck?

Ok So, I Already Have A Yellow & Orange Cat. I Want Another Cat That's Just White, But It's Under My Dad's Truck & My Mom Won't Let Me Keep It. Cause She Said That My Cat Would Hurt The Other Cat. It's A Girl Cat. She Just Had 2 Black Kittens That Are So Adorable. But I'm Just Worried That My Dad Might Bo To Work In The Morning & Squish Them>.< I Don't Want That Happening. There Homeless & Need A Home. & I Want Them To Live In My House. But I Don't Think My Cat Would Ever Harm Or Hurt Another Cat. I've Watched Him Played With Other Cats, Never Saw Him Hurt The Cat. But My Mom Thinks That He Might Harm The Cat-__-. & He Doesn't Even Hurt Kittens.I Sneaked Out At Night Earlier, & Heard Them Meow. & Saw Them Under My Dads Truck But My Mom Heard Me Coming & That's When I Ran Inside & My Mom Found Me Sneaking Out & Got In Trouble & Blah Blah Blah. Then She Went Upstairs & Back To Sleep. & That's When I Truned On The Porch Light & I Saw The Little Kittens & The Cat. I'm Really Worried About The Kittens & The Cats. I Hope Their OK. But I Really Want To Have Them But My Mom Won't Let Me. It's About To Be 6:00 AM In An Hour. I Woke Up Early SO I'm not Sleepy. Anyways, I Really Want Them As ME As The Owner, But Uggh, Idk What To Do. How Can I Convince Her & Gets Those Kittens Safe ? & Any Advice? No mean Comments Please?(: Thank You.