OpenVPN Site2Site - Routing Problem

[MarkArms]

Hi guys,
I had a working VPN between my house (server) and my parents' (client).
Then after a bad upgrade, I had to reinstall the client opnsense instance by scratch and I hadn't any backup.
I followed the documentation but this time I didn't succeed in making the VPN work: the VPN is established but I can't reach site 1 from site 2 and viceversa.
I think it's a matter of routes but I really can't know what to do more.
Once, I don't remember what I did, I succeeded in reach site 1 from the opnsense of site 2.

Any help is appreciated.

Regards,
Marco

[MarkArms]

From server LAN (192.168.25.0/24) I can ping 10.10.10.0 that is the VPN Tunnel address of the router on the client side.
From client LAN (192.168.125.0/24) I can ping 10.10.10.1 that is the VPN Tunnel address of the router on the server side.
I can't ping 192.168.125.0/24 from 192.168.25.0/24 and viceversa.

Regards