I also have the tan interior and a 1 year old. I had my car detailed and had them scotch guard all the upholstery. my son still spills juice but it doesn't leave a set in stain. I just keep a bottle of resolve handy and it comes right out.
The scotch guard really helps, I haven't had any issue with rain since either.
Sorry that didn't answer your seat question, but replacing then can get pricey.
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The "Upgrades"Alienationz Eyelids: LEDs in the map, dome, trunk, and license plate: Racingline STB bar: 5% window tint all around and a windshield brow
The To-Do List6000k HIDS: EE Halos: Tinted Tails: Exhaust: Rims: CAI: New Headunit: Lowering: Color Change