I'm sure you've posted about this before.
You can request furlough, but I would imagine that, unless they are already planning on furloughing staff, that your request will be turned down, as they have a job available for you to do.
You cannot force your employer to furlough you.
You could request a period of unpaid leave, or ask to use your annual leave.
In the meantime, you need to follow the guidance from the government and isolate away from your wife and children (in the same house) in order to keep them safe. Guidance is below.
^The rest of your household do not need to start shielding themselves, but they should do what they can to support you in shielding and to carefully follow guidance on social distancing.
At home you should:
Minimise the time other people living with you spend in shared spaces such as kitchens, bathrooms and sitting areas, and keep shared spaces well ventilated.
Keep 2 metres (3 steps) away from people you live with and encourage them to sleep in a different bed where possible. If you can, use a separate bathroom from the rest of the household. Use separate towels from the other people in your house, both for drying themselves after bathing or showering and for hand-hygiene purposes.
If you share a toilet and bathroom with others, it’s important that they are cleaned every time after use (for example, wiping surfaces you have come into contact with). Consider drawing up a rota for bathing, with you using the facilities first.
If you share a kitchen with others, avoid using it while they’re present. If you can, take your meals back to your room to eat. If you have one, use a dishwasher to clean and dry the family’s used crockery and cutlery. If this is not possible, wash them using your usual washing-up liquid and warm water and dry them thoroughly. If you are using your own utensils, remember to use a separate tea towel for drying these.
Everyone in your household should regularly wash their hands, avoid touching their face, and clean frequently touched surfaces.
If the rest of your household are able to follow this guidance, there is no need for them to take the full protective measures to keep you safe.^