wifi wrong dhcp ip address

My daughter's iPhone 6 and her iPad air are not connecting to our wifi router. My husband's (iPhone 5s), my iPhone 6, his iPad Air2, iPad 2, her Macbook Pro (Yosemite), an old iPad1 my husband uses for reading, and the family iMac (Yosemite) are connecting as normal. All our IOS devices are running IOS 8.1.2 except for daughter's iPad Air (8.0.2). While I understand this has been a common problem of late, mine seems to have a variation, in the area of the router assigned dhcp addresses.

Internet is via cable. The wifi router is a Netgear 6300v2. I just recently updated the router firmware.

The issue is that for both of her devices, the DHCP ip addresses are 169.xxx.xxx.x.x. These are some kind of internal domain ip addresses I believe, instead of the domain number of the router 192.xxx.x.x. What is causing this and why is it not happening the same to all our devices? Is there something she could have installed that is causing this issue, is someone hacking her devices?

What I have tried (on both her iPhone and her iPad)

restarting

resetting (several times)

forgetting and re-entering network name and password, several times

renewing lease

resetting network settings

under location services, turning off wi-fi

I have not yet asked her to set both devices up as new. Is that the best solution or is it time to visit Apple authorized dealer?

Thanks for any help and education you can provide.

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