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You can subscribe for up to 3000 instruments on a single WebSocket connection and receive live quotes for them. Single API key can have upto 3 websocket connections.I only have kite account, so trading only for me.
You can create Kite Connect apps with you Zerodha account only. No need to open accounts for this reason.
PS: You can always open an account and gift wealth creating stocks to your loved ones
Zerodha now supports account opening for kids online. You can know more here.
so like can I also place orders as well with different api key and access tokens on same account
and modify the order placed from other api key ?