Create 3 vlans from 3 non vlan aware routers

Depends what you exactly want to achieve. In a strict IEEE 802.1Q VLAN sense, each VLAN is a dedicated network, has a dedicated IP subnetwork (as shown on your plan) on each network, and only a L3 router can make IP communication.

With the two consumer routers added, there won't be much luck - because these routers a doing many2one NAT routing (all LAN IPs NAT to a single WAN IP), most likley these can't be configured as "normal" routers connecting two IP subnets so bi-diectional routing beteen the IP subnets as shown would be possible. If the routers would be "normal" routers, adding some static routers would do the job. 

You can _try_ your luck configuring a so called asymmetrical VLAN config, with just L2 tricking - all devices run on the same IP subnet. Look here:

1. Create the VLAN 10, name it "Family (for port 1..8)
2. Create the VLAN 20, name it "Intranet" (for port 9..12)
3. Create the VLAN 30, name it "Guest" (for port 13..14) 
   Let's keep port 15 and 16 for future usage, see below
4. For the moment, keep VLAN 1 eg. [U]ntagged on Port 16 for the management, until the management VLAN is changed e.g. to VLAN 10 (for simplicity). Remove any VLAN membership for VLAN 1 from all ports, eg. 1..24. 
5. Make all ports [U]ntagged members of the VLAN 10.
6. Set ports 1..8 to PVID 10.
7. Make ports 9..12 [U]ntagged members of the VLAN 20.
8. Set ports 9..12 to PVID 20.
9. Make ports 9..12 [U]ntagged members of the VLAN 20.
10. Set ports 13..14 to PVID 30.
11. Name port 8 "InetRouter"
12. Keep port 8 "InetRouter" as an [U]ntagged member of VLAN 10.
13. Make port 8 "InetRouter" [U]ntagged member of VLAN 20
14. Make port 8 "InetRouter" [U]ntagged member of VLAN 30
15. Name port 12 "Printer"
16. Make port 8 "Printer" [U]ntagged member of VLAN 10 (reachable for Family VLAN) 
17. Make port 8 "Printer" [U]ntagged member of VLAN 30 (reachable for Guest VLAN)
18. Note: Intranet VLAN 20 can't reach the Internet - so the printer can't use cloud based supply management (like HP Instant Ink, send notifications, link up to some Intenret based cloud printing, ...)
19. Connect the Sky router LAN to port 8 "inetRouter".
20. Connect the printer to port 12 "Printer"

Now you can put up three test systems, one on the "Family" VLAN, port 1..7 (remember: port 8 "InetRouter" is reserved for the Sky router LAN), one on the "Intranet" 9..11, and one on the "Guest" VLAN port 13..14. All will receive an address from the router by DHCP, no static IPs required. Test "Family" can reach the Internet, the Printer, other "Family", but not "Intranet" or "Guest". Test "Intranet" can only reach the "Internet" and the "Printer" [and other "Intranet"] but neither "Guest" nor "Family". Test "Guest" can only reach "Internet" [and other "Guest"], but neither "Intranet" nor "Family".

For the WLAN: If possible configure both other consumer routers plain wireless access points, configure one as "Family" and one as "Guest". Connect the appropriate port (some routers in AP mode require using the WAN port, others the LAN port) to a "Family" port resp. a "Guest" port.

Better solution would be a simple business AP like a WAC124 or WAX204 (if you need just one AP), if considering more look for a mesh-capable WAC505/510/540 or a WAX610 for example.

Configure the switch port #15 (that's why we kept it untouched) for using the VLAN 10 [U]ntagged, PVID 10; VLAN 20 [T]agged, VLAN 30 [T]agged.
Configure the access point with three SSIDs - "Family" VLAN 10 untagged, "Intranet" VLAN 20 tagged, and "Guest" VLAN 30. Last step is making the management VLAN 10 untagged, and connect it to Port 15.

The Sky router WiFi will still connect to the "Family" network.

Now associate a test system to each of the three WLAN SSIDs, and run the same tests as above.

Have fun!