That DRZ, not a good deal. IMO
At ages 5 and 8 I would buy a Honda crf/xr50 and Honda crf/xr70 both 4 stroke. Or Yamaha PW80 (2 stroke)for the 8 year old. All 3 speed clutchless transmissions. Buy used, ride a couple years then sell for about $100 less than what you paid. Tough part is all the safety gear, They grow out of boots and helmets fast. Buy new helmets that fit well. My kids have worn hockey and skateboard knee/elbow pads over the years, use what you can find and cover them up. Motocross jersey seems to be key for not destroying every shirt they own. Goggles are mandatory, and gloves will save you some tears.
98 uzj100. Factory rear-ARB front locked 4.88's. ARB Bull, Warn 9000, Irbis rear bumper, Slee sliders and belly pan. OME t-bars w/863 rears, HID, XM