A couple are married. Let's call them gender-ambiguous names like Lesley and Vic. They have a son who's a late walker, just cruising at 16 months & can bum shuffle well.
Lesley's remaining elderly parent has 2 medium sized dogs which are untrained, have a history of "nipping" people's ankles, and cannot be restrained by said elderly parent (e.g. during walks, cannot control them pulling along, cannot be trusted to walk on the pavement or stop at road crossings, have to be walked without a lead by letting them run free in a public park). When Lesley and Vic were dating, when entering the house, Vic used to hide behind Lesley because the dogs are so boisterous and full-on at entering that they were being pushed over/unable to control being shoved whilst walking up stairs/etc. and frequently had ripped clothing (etc) where dogs had jumped up and couldn't be restrained (claws caught).
Lesley is now a SAHP. Vic works fulltime during the week (M-F) in a full-on stressful but well paid role.
Vic has asked Lesley to not take toddler to their parents (unless an emergency/something unusual) during the work week so that Lesley is never in the position of having to leave toddler unattended e.g. to go to the toilet, whilst the dogs are in the home. Visits to elderly parent are infrequent (every 2 or 3 months). Vic says that weekend visits are better so that both parents can go together, any time. Vic says that the concerns are around toddler being on the floor, and the dogs either being too boisterous or startling (near a main road) and deciding to bite... as well as just generally, say, putting crap in the mouth whilst on the (usually dirty, hairy) floor there.
Lesley feels that as an able, independant adult they should be able to take their toddler wherever they want, and feels like Vic is being overly controlling; they would "be careful and ensure toddler is safe". Typically, Vic has a history of being more risk adverse than Lesley, and does try to control situations beyond the norm. Lesley is generally extremely responsible but does not respond well in an emergency, and downplays risk a lot (e.g. leaving toddler in a locked car with all windows closed "for a couple of mins" in car park whilst nipping into a shop).
Vic feels like the risk/reward ratio of limiting visits to elderly parent makes the route forward easy - just stick to weekends. But Lesley feels like their freedom and ability to parent is stifled.
YABU - Vic should calm down, trust Lesley to keep toddler safe.
YANBU - Lesley needs to act on Vic's concerns, why take the risk if non-emergency visits can be limited to weekends so both can be there?