First go and check BRV, For me it was very uncomfortable to sit with 2 people other than me in the second row. Width wise i felt crushed. 3rd row had no leg space for adults only children.
Check it our yourself and see if your space needs are fulfilled, if not then why not get an Altis 1.6 instead on yaris 1.5 when you ok with spending 5lakh more on BRV