In this time of isolation, there is no better chance to fix or improve your family relations. Done well, this isolation may just allow your family to grow closer together, by making each other realise things the other did not. Parenting is a highly subjective matter, but I believe this post might help give the general guidelines.
The first to give your attention to is Subtlety. Well I say that but its more of establishing warmth through order (indirectly of course). Lets say the problem here is that your child is holed up in their room and using gadgets for an excessive amount of time. The more direct and order-based approach is confronting them head on and limiting their gadget time. Most children might see this as irrational, so if they can't accept this rule at first use Logic to tell them your reasoning.
Tell them that they need to rest or give gadgets a break to keep themselves healthy. This logical explanation should tell them why you are making a "gadget rule" while also giving you, as a parent, more opportunities to socialise with them. A good and obvious gadget rule is no gadgets during family lunches/dinner, or a couple of 30minute-1hour gadget breaks.
Of course, it is important to be understanding as well. With "Staying at home" comes a whole lot of homework for both adults and students. When making rules, to be mindful and flexible to what your child's responsibilities are (if any). Because without this mindfulness, you could lead them to think that you are limiting their right to study and be productive.
Once you get your rules straight, try to actively socialise with them once the limits have been set. Some good starting points could even be in school tasks. If your in a pinch, try asking them about what they are doing in classes (assuming this is online classes). Remember; "you know your child best," so if they like to separate school from home, then when you are together (whenever the gadgets are off) try to avoid school/work related topics. Though this process is slow, even if you don't have much to talk about, as long as the gadgets are kept separate from family time, it will eventually lead to them opening up.
It doesn't have to be perfect. Imposing gadget rules and seeing that they follow it is already good enough. In fact, a good and subtle way to form relations with your children could even be from watching TV. Issue a time where personal use of gadgets are banned and that you, as a family, should use it together. Watching a movie, even if its silent, is surprisingly effective in closing distances between family members. Even if you can't have the so-called perfect family discussions, your presence as a family in and of itself is already a good thing.
This next point is a little focussed to you Dads out there. If you make gadget rules and have the opportunity to have some family time, then use it! During these times, yes it is important to do your online work/jobs. But if you can, pay attention and spend some more time with the rest of the family no matter how small. No matter how insignificant it may be, your presence which may already be something rare, is a very important thing.
To conclude (from this first post at least): Order, Mindfulness, and Presence. Used correctly, these three factors no matter how subtle, active, straightforward, witty, awkward, comedic, or how "good" conversations go, will slowly but surely improve your relation in this isolation.
(Disclaimer: It is imperative for me to stress out that if you think you need professional help, then please do get some professional opinion. This is the right course of action if you, as a parent, may be facing such difficulties.)
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