Used Ibert for bike for babies and children to ride with parents has extra bike attachment as well.

https://www.amazon.com/iBert-Safe-T-Seat-Front-Child-38-Pounds/dp/B0048MB82A

this is the one we have and we paid 25.00 for the extra mounting bar https://www.amazon.com/iBert-Extra-Mounting-Safe-T-Seat/dp/B006M7QQXU/ref=pd_sim_468_1?ie=UTF8&pd_rd_i=B006M7QQXU&pd_rd_r=NSWW00MYB83M49CP1PAE&pd_rd_w=ttgSN&pd_rd_wg=lYa3U&psc=1&refRID=NSWW00MYB83M49CP1PAE

we bought at rei about 3 years ago. 50.00 obo

frances carpenter 507-3687 or email if interested.