Certain Buttons / Tabs dont work on ipad/safari

So you do have an iPad2. This iPad is obsolete. The OS and associated Safari (and other) web browsers are unlikely to be able to properly render many modern websites.

Other than replacement of the iPad2 with a much more recent iPad, you’ll not be able to resolve your problem.

Did you intend to post exactly the same question - as already answered?

You have mentioned that existing links are already broken.

Websites and URLs change over time - and this is likely to be the reason that you are having difficulties with old links. In replicating old links, you’ll replicate anything that doesn’t work.

It is increasingly unclear what you are attempting to achieve. As now understood, your father has an iPad2 (now long obsolete) with saved website links that are now broken and don’t work.

You have another iPad that can access the links that are inaccessible using the old iPad - and you are attempting to replicate the old iPad. If the new iPad works - where the old iPad doesn’t - what precisely is the issue?

iPad2 (?) can only be updated to iOS 9.3.5 (WiFi Only models) or iOS 9.3.6 (WiFi & Cellular models).

Apple ended update support for iPad2 ceased in September 2016. An iPad2, iPad3 and iPad mini1 cannot be updated to iOS 10 or later major versions of iOS, as the internal hardware does not meet the minimum technical requirements for new versions of iOS/iPadOS. This limitation cannot be bypassed; these are 32-bit architecture devices, whilst all recent versions of iOS/iPadOS are designed for 64-bit hardware platforms. iPad2, iPad3 and iPad mini1 are all obsolete.

Without benefit of technical update, the embedded browser will be unable to access many elements of modern websites - notwithstanding issues with unpatched security vulnerabilities.

Please clarify the iPad model - and installed version of iOS - with which you are having difficulties:

Settings > General > About

Not sure which iPad you have? Identify your iPad model.