We cannot understand why scientists have to resort to weirdness to explain physical phenomena. Confinement and Entanglement are not quantum phenomena alone, but they have macro examples also. Superposition of states arises out of the mechanism of measurement, which has been sensationalized by imputing imaginary characteristics to it.
As we have explained in our essay, every particle in the Universe is ever moving with respect to something or the other. Measurement is conducted at a designated instant called "here-now" and the result of that measurement is used at subsequent times, when the particle no longer retains those characteristics, but has temporally evolved. Thus, only its state at the said instant can be known with certainty. It's true state before and after measurement, which is not a single state, but an ever changing state, cannot be known. This unknown state, which is a composite of all possible states, is known as the superposition of states.
When two objects retain their original relationship after being physically separated, such relationship is called entanglement. Suppose someone while traveling forgot to take one of the pair of socks. The individual sock of the pair is complementary to the other. They cannot be used in isolation. If someone asks, 'which of the pairs has gone with the traveler', the answer will be unknown till someone at either end finds out by physical verification. This is a macro example of entanglement. Before the verification (measurement) was done; which one went out was not known. It could have been either one (superposition of all states). After measurement the answer is conclusively known (wave function collapses). There is no need to unnecessarily sensationalize it. The quantum entanglement can be easily explained if we examine the nature of confinement and the measure the distance up to which entanglement shows up (generally, it is not infinite, but lasts up to a maximum of a few kilo meters only).
Not only quarks, but also all particles are confined. LHC has surprised physicists / cosmologists that the early universe was a 'perfect fluid' and not an 'explosion of gases' that is the basis of all current theories. Particles are nothing but confined fluids; that is described as the primordial field. The mechanism by which this fluid is confined will be discussed separately (using simple verifiable models and without Higg's mechanism). Just like only the atoms (molecules) and their combinations exhibit definite chemical properties, only quarks are the first particles to exhibit this property of confinement. Hence if we try to break their confinement, the applied energy leads to formation of other quarks not due to uncertainty principle, but due to simple mechanism of inertia of motion and inertia of restoration (elasticity). Even within the confinement, the up quarks change to down quarks and vice versa. This property is exhibited by all particles.
Confinement requires a central stable point around which the mass (confined field) accumulates and the external limit of the confinement which gives rise to the stabilized orbits. There is space between these two positions. This gives a three fold structure. Since inside the particle, it is all fluid or locally confined fluid (sub-systems), it is unstable. If some force is applied to move a smaller portion of the fluid, it generates an equal force in the opposite direction. This is exhibited as the charge of the particle. Where this force interacts with other forces, it may become non-linear. Otherwise, it behaves linearly. The linear behavior is known as quantum entanglement. Electrons and photons are special cases of this confined fluid.
Regarding Relativity, we have proved in other posts that it is a wrong description of facts and that Einstein's mathematics is wrong. Since it is very lengthy, we are not reproducing it here. Those interested may read our post below the essay of Mr. Castel and Mr. Granet.