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They should be able to still use the existing wiring. That's what happened when we went to fibre.
I would recommend some sort of back up power supply or a UPS for the fibre box (ONT) otherwise when the power goes off so will the phone and I suspect they're used to the phone still working with the power off. If they have a cell phone then this may not be an issue for them.
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Presuming the in- laws currently have adsl over their copper, they should have a copper outlet feeding their modem. If the techs install the fibre OTN in the same location then connecting the phone outlet of the OTN to that outlet should access the existing internal copper wiring and all existing hard-wired phones. Of course remove any adsl filters.
If they use cordless phones then fitting a UPS may not make sense unless they are the latest types with internal battery backup.
Scotdownunder:Presuming the in- laws currently have adsl over their copper, they should have a copper outlet feeding their modem. If the techs install the fibre OTN in the same location then connecting the phone outlet of the OTN to that outlet should access the existing internal copper wiring and all existing hard-wired phones. Of course remove any adsl filters.
If they use cordless phones then fitting a UPS may not make sense unless they are the latest types with internal battery backup.
An issue I found with integrated wiring is ringing volume. Traditionally 90 volts at 16Hz is used and with a copper connection there is sufficient strength to ring several phones. However with fibre the ringing voltage is produced within the ONT and seems well short of 90 volts and limited output available only. So the phones do not ring as loudly as they did with copper. Wireless handsets would not be affected as the ringing sound is produced in the handset powered by its internal battery. This seems something to have to be lived with.
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