Parenting is Unique ID 350 in the IAB Audience Taxonomy 1.1, in the Interest branch under Interest → Family and Relationships. Trillboards emits it on the bid request as a segtax=4 segment, the code every IAB-compliant DSP already reads, so a buyer already running "Parenting" elsewhere can point that strategy at DOOH screens without rewriting taxonomy. Over the most recent 30-day window the network logged 2,810 cohort observations tagged with this segment across the 29,000+ screens registered on our own network.
Trillboards inventory concentrates in Taxi Rideshare Tv, Convenience Store, Retail Other. Taxi Rideshare Tv is the largest category at 14,760 approved screens, average floor $2.88 CPM. Those are network-wide venue counts; add a venue filter to the line item to hold delivery to the surfaces you want.
Buying one or two tiers up captures more of the network and less of the segment; buying this leaf does the reverse. The OpenRTB payload carries every level of the chain, so a single bid request can be targeted at Parenting or at any node above it. Interest cohorts land hardest when the venue reinforces the interest, so pair the segment with a venue filter.